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Cast On Critical Strike Support

Cast On Critical Strike SupportSupport, Spell, TriggerIcon: &Mana Multiplier: 140%Can Store 1 Use(s)Cooldown Time: 0.15 secRequires Level 38Must support both an attack skill and a spell skill to work. The attack skill will trigger a spell when it critically strikes an enemy. Cannot support totems, traps, or mines. Vaal skills, channelling skills, and skills that reserve mana cannot be triggered.Per 1% Quality:Supported Skills have 1% increased Attack Critical Strike ChanceSupported Attacks will Trigger a Supported Spell when you Crit an EnemyThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.AcquisitionLevel: 38Purchase Costs

Skill functions and interactions

This section may contain out-of-date information. Please help improve the page by updating it.

There is an internal cooldown to how fast spells can be triggered, as of patch 3.5 the cooldown is 150ms, or roughly 6 casts per second given optimal conditions.

In case of multiple spells linked to one attack skill this support will alternate the spell being triggered.

Trigger order: Trigger gems and their linked skills are cast in a certain order that depends both on which item it is equipped on and which socket the skills are in. If there are trigger gems in each equipped item, the order of operation will be:

Main hand ⇒ Amulet ⇒ Helm ⇒ Off hand ⇒ Body armour ⇒ Gloves ⇒ Boots

The linked sockets also follow a specific order, as follows:

1 ⇒ 2
⇓
4 ⇐ 3
⇓
5 ⇒ 6

Cooldown Time: When a supported spell is successfully cast, it and all supported spells of the same name are put on cooldown for 150 milliseconds. This means that a given spell can only trigger once per critical strike, and reduces the effect of linking multiple copies of the same spell to this support (especially when it is at a higher gem level). It is important to note that this cooldown does not apply to the gem as whole; you can trigger multiple spells within the 150 millisecond cooldown time as long as they are different.

Gem level progression

Level

More SpellDamage

Exp.

Total Exp.

1

38

40

27

N/A

0

0

2

40

41

29

N/A

388,734

388,734

3

42

43

30

N/A

477,437

866,171

4

44

45

31

N/A

583,786

1,449,957

5

46

47

33

N/A

710,359

2,160,316

6

48

49

34

N/A

1,355,511

3,515,827

7

50

51

35

N/A

1,138,877

4,654,704

8

52

53

37

N/A

1,368,233

6,022,937

9

54

55

38

N/A

1,638,338

7,661,275

10

56

57

39

N/A

1,956,648

9,617,923

11

58

58

41

N/A

3,655,184

13,273,107

12

60

60

42

N/A

3,017,327

16,290,434

13

62

62

43

N/A

3,576,232

19,866,666

14

64

64

44

N/A

4,231,667

24,098,333

15

65

65

45

N/A

2,395,078

26,493,411

16

66

66

46

N/A

8,421,063

34,914,474

17

67

67

46

N/A

16,159,983

51,074,457

18

68

68

47

N/A

41,170,367

92,244,824

19

69

69

48

N/A

86,794,448

179,039,272

20

70

70

48

N/A

157,405,063

336,444,335

21

72

72

50

N/A

N/A

N/A

22

74

N/A

N/A

N/A

N/A

N/A

23

76

N/A

N/A

N/A

N/A

N/A

24

78

N/A

N/A

N/A

N/A

N/A

25

80

N/A

N/A

N/A

N/A

N/A

26

82

N/A

N/A

N/A

N/A

N/A

27

84

N/A

N/A

N/A

N/A

N/A

28

86

N/A

N/A

N/A

N/A

N/A

29

88

N/A

N/A

N/A

N/A

N/A

30

90

N/A

N/A

N/A

N/A

N/A

31

91

N/A

N/A

N/A

N/A

N/A

32

92

N/A

N/A

N/A

N/A

N/A

33

93

N/A

N/A

N/A

N/A

N/A

34

94

N/A

N/A

N/A

N/A

N/A

35

95

N/A

N/A

N/A

N/A

N/A

36

96

N/A

N/A

N/A

N/A

N/A

37

97

N/A

N/A

N/A

N/A

N/A

38

98

N/A

N/A

N/A

N/A

N/A

39

99

N/A

N/A

N/A

N/A

N/A

40

100

N/A

N/A

N/A

N/A

N/A

Item acquisition

Upgrade paths

This item can be acquired through the following upgrade paths or vendor recipes:

Gemcutter's PromiseGemcutter's Promise3Superior GemQuality:+20%"I swore to use my position to help the people. What good is power when it just accumulates on the already-powerful?" - Erasmus, Imperial Gemcutter

random superior gem (Q20)

Automatic

7

Dialla's SubjugationDialla's Subjugation7Superior Support GemQuality:+23%CorruptedA symbol of beauty and innocenceThe gems corrupted her mindMalachai corrupted her gemsAll but a glimmer ofgreatness lost in madness

random corruptedsuperior Support gem (Q23)

Automatic

6

The FoxThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox."- Ezomyte Proverb

random level 20 gem

Automatic

Vendor reward

This item can be bought at the listed npc vendors after completing the following quests:

Strategy

Linking with other skills

At a bare minimum, a Cast On Critical Strike setup will require three gems: an attack, Cast On Critical Strike itself, and a spell to be triggered. This generally leaves at most three other supports that may be linked. If possible, the supports should both increase the number of times Cast On Critical Strike triggers, and increase the effectiveness of the triggered spells. Note that Cast On Critical Strike cannot trigger more than once per frame, so staggered hits (e.g. multiple projectiles) are preferred to simultaneous hits (e.g. most area of effect damage) which will only proc at most once per attack.

Projectile

By far the most popular family of Cast on Critical Strike setups, projectile Cast On Critical Strike focuses on the projectile keyword. Popular attacks for this purpose include:

Spectral ThrowSpectral ThrowAttack, ProjectileMana Cost: (7-9)Cast Time: 1.00 secProjectile Speed: 1000Throws a spectral copy of your melee weapon. It flies out and then returns to you, in a spinning attack that damages enemies in its path.Per 1% Quality:0.5% increased Attack SpeedDeals (80-100)% of Base DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Naturally staggers hits, automatic pierce, allows the use of melee weapons at range.

BarrageBarrageAttack, Projectile, BowMana Cost: (7-11)Cast Time: 1.00 secEffectiveness of Added Damage: (40%-48%)Requires Level 12After a short preparation time, you attack repeatedly with a ranged weapon. These attacks have a small randomised spread. Only works with Bows and Wands.Per 1% Quality:0.5% increased Projectile DamageDeals (40-47.6)% of Base DamageFires 4 additional ProjectilesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Causes a large number of sequential hits per attack.

Power SiphonPower SiphonAttack, ProjectileMana Cost: (7-11)Cast Time: 1.00 secEffectiveness of Added Damage: (125%-151%)Requires Level 12Fires your wand to unleash projectiles that fire toward enemies in front of you or to your sides, dealing increased damage and granting you a power charge if an enemy is killed by, or soon after, the hit.Per 1% Quality:1% increased DamageDeals (125-150.7)% of Base DamageFires (4-7) additional Projectiles20% chance to gain a Power Charge when Projectile Hits a Rare or Unique Enemy+10% to Critical Strike Multiplier per Power Charge20% increased Critical Strike Chance per Power ChargeCulling StrikePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Naturally produces power charges.

Split ArrowSplit ArrowAttack, Projectile, BowMana Cost: (6-10)Cast Time: 1.00 secProjectile Speed: 3260Fires multiple arrows at different targets.Per 1% Quality:0.5% increased Attack SpeedDeals (100-119)% of Base DamageFires (4-8) additional ArrowsPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Naturally large number of projectiles.

Tornado ShotTornado ShotAttack, Projectile, BowMana Cost: (8-10)Cast Time: 1.00 secEffectiveness of Added Damage: (90%-109%)Requires Level 28Fires a piercing shot that travels until it reaches the targeted location. It will then fire projectiles out in all directions from that point.Per 1% Quality:1% increased Projectile DamageDeals (90-109)% of Base DamageFires 3 secondary ProjectilesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Piercing on initial arrow(s) and produces three times as many subprojectiles.

Molten StrikeMolten StrikeAttack, Projectile, AoE, Melee, Strike, FireMana Cost: 6Cast Time: 1.00 secEffectiveness of Added Damage: (120%-130%)Projectile Speed: 750Attacks enemies with physical and fire damage, causing balls of molten magma to launch forth from the enemies you hit, divided amongst all enemies hit by the strike. These will explode, causing AoE attack damage to enemies where they land.Per 1% Quality:1% increased Fire DamageDeals (120-130)% of Base Damage60% of Physical Damage Converted to Fire DamageFires 2 additional ProjectilesProjectiles deal 50% less DamageDamage Over Time caused by Projectiles deals 50% less Damage+(2-6) to Melee range(2-75) to (3-113) Added Attack Fire DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Magma balls generally hit on different frames, causing a large number of hits.

Lightning StrikeLightning StrikeAttack, Projectile, Melee, Strike, LightningMana Cost: 6Cast Time: 1.00 secEffectiveness of Added Damage: (135%-180%)Requires Level 12Infuses your melee weapon with electrical energies as you swing. In addition to converting some of your physical damage to lightning damage, the stored energy is released from the weapon as projectiles as you strike, flying out to hit farther-away enemies. The projectiles cannot miss if the melee attack hits a target.Per 1% Quality:1% increased Damage1% increased Projectile SpeedDeals (135-180)% of Base Damage50% of Physical Damage Converted to Lightning DamageFires (4-7) additional ProjectilesProjectiles deal 25% less DamageDamage Over Time caused by Projectiles deals 25% less Damage(1-9) to (13-179) Added Attack Lightning DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Three projectiles plus the initial hit.

Support skills that affect both the number of hits and crits projectile attacks generate and affect projectile spells include:

Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, ProjectileIcon: PMana Multiplier: 165%Requires Level 38Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills fire 4 additional ProjectilesSupported Skills deal (35-26)% less Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Chain SupportChain SupportSupport, Chaining, ProjectileIcon: cMana Multiplier: 150%Requires Level 38Supports projectile skills, and any other skills that chain.Per 1% Quality:Supported Skills have 1% increased Projectile SpeedSupported Skills Chain +2 timesSupported Skills deal (30-11)% less Damage with HitsThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Faster Projectiles SupportFaster Projectiles SupportSupport, ProjectileIcon: jMana Multiplier: 110%Requires Level 31Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills have (50-69)% increased Projectile SpeedSupported Skills deal (20-29)% increased Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. for Spectral ThrowSpectral ThrowAttack, ProjectileMana Cost: (7-9)Cast Time: 1.00 secProjectile Speed: 1000Throws a spectral copy of your melee weapon. It flies out and then returns to you, in a spinning attack that damages enemies in its path.Per 1% Quality:0.5% increased Attack SpeedDeals (80-100)% of Base DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and certain spells

Fork SupportFork SupportSupport, ProjectileIcon: YMana Multiplier: 130%Requires Level 31Supports projectile skills, making their projectiles fork into two projectiles the first time they hit an enemy and don't pierce it.Per 1% Quality:Supported Skills deal 0.5% increased Projectile DamageSupported Skills deal (-10-9)% more Projectile DamageSupported Skills ForkThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Pierce SupportPierce SupportSupport, ProjectileIcon: pMana Multiplier: 110%Supports projectile skills.Per 1% Quality:Supported Skills deal 0.5% increased Projectile DamageProjectiles from Supported Skills Pierce (2-4) additional TargetsSupported Skills deal (0-19)% more Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Power Charge On Critical SupportPower Charge On Critical SupportSupportIcon: PMana Multiplier: 110%Requires Level 18Supports any skill that hits enemies.Per 1% Quality:Supported Skills have 1% increased Critical Strike ChanceSupported Skills have (35-54)% chance to gain a Power Charge on Critical StrikeSupported Skills deal 4% more Damage per Power ChargeThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Increased Critical Strikes SupportIncreased Critical Strikes SupportSupportIcon: sMana Multiplier: 115%Requires Level 8Supports any skill that hits enemies.Per 1% Quality:Supported Skills have 1% increased Critical Strike ChanceSupported Skills have (50-88)% increased Critical Strike ChanceSupported Skills have +(1-1.9)% to Critical Strike ChanceThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Useful projectile spells and their support limitations include:

Arctic BreathArctic BreathSpell, Projectile, Duration, AoE, ColdRadius: 12Mana Cost: (8-23)Cast Time: 0.70 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 80%Projectile Speed: 844Requires Level 12Fire an icy projectile that bursts on impact or when reaching the targeted area, dealing area damage and creating a chilling area that deals cold damage over time. This area will creep across the ground towards nearby enemies until its duration expires.Per 1% Quality:0.5% increased Area of EffectDeals (13-350) to (19-524) Cold DamageBase duration is 5 secondsCan have up to 10 Chilling AreasDeals (16.7-1383.5) Base Cold Damage per secondModifiers to Spell Damage apply to this Skill's Damage Over Time effectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Does not explode on pierce, fork, or chain.

Ball LightningBall LightningSpell, Projectile, AoE, LightningRadius: 22Mana Cost: (13-25)Cast Time: 0.75 secCritical Strike Chance: 5.00%Effectiveness of Added Damage: 40%Projectile Speed: 400Requires Level 28Fires a slow-moving projectile that periodically damages enemies in an area around it with bolts of lightning.Per 1% Quality:1% increased Lightning DamageDeals (3-22) to (48-426) Lightning DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Not affected by pierce, fork, or chain; hit rate limited per cast, not per projectile.

Ethereal KnivesEthereal KnivesSpell, Projectile, PhysicalMana Cost: (5-20)Cast Time: 0.60 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 120%Projectile Speed: 1300Fires an arc of knives in front of the caster which deals physical damage.Per 1% Quality:1% increased Projectile SpeedDeals (7-633) to (10-949) Physical DamageFires 9 additional Projectiles(0-19)% increased Projectile SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Little benefit from Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, ProjectileIcon: PMana Multiplier: 165%Requires Level 38Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills fire 4 additional ProjectilesSupported Skills deal (35-26)% less Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. but more from Faster Projectiles SupportFaster Projectiles SupportSupport, ProjectileIcon: jMana Multiplier: 110%Requires Level 31Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills have (50-69)% increased Projectile SpeedSupported Skills deal (20-29)% increased Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket..

FireballFireballProjectile, Spell, AoE, FireRadius: 9Mana Cost: (6-25)Cast Time: 0.75 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 180%Projectile Speed: 1040Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Per 1% Quality:0.5% chance to Ignite enemiesDeals (9-1095) to (14-1643) Fire Damage(20-39)% chance to Ignite enemies(50-88)% more Damage with Ignite+(0-4) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Does not explode on pierce, fork, or chain.

Freezing PulseFreezing PulseSpell, Projectile, ColdMana Cost: (5-21)Cast Time: 0.65 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 150%Projectile Speed: 1800An icy projectile which has a chance to freeze enemies it passes through. The projectile fades quickly, reducing damage and freezing chance until it dissipates.Per 1% Quality:2% increased Projectile SpeedDeals (8-888) to (12-1332) Cold DamageProjectiles Pierce all Targets(0-19)% increased Projectile SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Benefits from Faster Projectiles SupportFaster Projectiles SupportSupport, ProjectileIcon: jMana Multiplier: 110%Requires Level 31Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills have (50-69)% increased Projectile SpeedSupported Skills deal (20-29)% increased Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket..

Ice SpearIce SpearSpell, Projectile, ColdMana Cost: (8-23)Cast Time: 0.70 secCritical Strike Chance: 7.00%Effectiveness of Added Damage: 80%Projectile Speed: 1000Requires Level 12Launches shards of ice in rapid succession. After travelling a short distance they change to a second form, which moves much faster and pierces through enemies.Per 1% Quality:2% increased Projectile SpeedDeals (22-383) to (33-575) Cold DamageSecond form has 600% increased Critical Strike ChanceSecond form has 300% more Projectile SpeedSecond form has +(30-49)% to Critical Strike MultiplierFires an additional ProjectilePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Already pierces in first form.

Magma OrbMagma OrbSpell, AoE, Fire, Projectile, ChainingMana Cost: (6-23)Cast Time: 0.70 secCritical Strike Chance: 5.00%Effectiveness of Added Damage: 140%Lob a fiery orb that explodes as it hits the ground. The skill chains, releasing another fiery orb that repeats this effect.Per 1% Quality:1% increased DamageDeals (9-716) to (12-1073) Fire DamageChains +(1-2) TimesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

SparkSparkSpell, Projectile, Duration, LightningMana Cost: (5-21)Cast Time: 0.65 secCritical Strike Chance: 6.00%Projectile Speed: 560Launches unpredictable sparks that move randomly until they hit an enemy or expire.Per 1% Quality:1% increased Projectile SpeedDeals (1-63) to (20-1198) Lightning DamageBase duration is 2 secondsFires (4-6) additional Projectiles(0-19)% increased Projectile SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Less benefit from Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, ProjectileIcon: PMana Multiplier: 165%Requires Level 38Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills fire 4 additional ProjectilesSupported Skills deal (35-26)% less Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. but more from Faster Projectiles SupportFaster Projectiles SupportSupport, ProjectileIcon: jMana Multiplier: 110%Requires Level 31Supports projectile skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have 0.5% increased Cast SpeedSupported Skills have (50-69)% increased Projectile SpeedSupported Skills deal (20-29)% increased Projectile DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket..

A second spell may satisfactorily be used in place of a support.

Area of Effect

Some attacks have advantageous built-in area of effect:

Ground SlamGround SlamAttack, AoE, Physical, MeleeRadius: 35Mana Cost: 6Cast Time: 1.00 secAttack Speed: 90% of BaseEffectiveness of Added Damage: (95%-125%)The character slams the ground in front of them with a Staff, Axe, Mace or Sceptre, creating a wave that travels forward and damages enemies with an increased chance to stun. The wave deals more damage to closer enemies.Per 1% Quality:1% increased Stun Duration on enemies0.5% increased Area of EffectDeals (95-125)% of Base Damage25% reduced Enemy Stun ThresholdDeals up to (40-49)% more Damage to closer targets(2-75) to (3-113) Added Attack Physical Damage+(0-6) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: The area of effect is progressive, not instant, allowing multiple casts per attack. However, it can only get one cast against a single target.

This works well with spells which have Area of Effect component, such as:

Cold SnapCold SnapSpell, AoE, Cold, DurationRadius: 16Mana Cost: (11-28)Can Store 1 Use(s)Cooldown Time: 3.00 secCast Time: 0.85 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 140%Requires Level 16Creates a sudden burst of cold in a targeted area, damaging enemies. This also creates an expanding area which is filled with chilled ground, and deals cold damage over time to enemies. Enemies that die while in the area have a chance to grant Frenzy Charges. The cooldown can be bypassed by expending a Frenzy Charge.Per 1% Quality:0.5% increased Area of EffectDeals (32-666) to (47-999) Cold DamageBase duration is 5 secondsDeals (26.3-1193.2) Base Cold Damage per second25% chance to gain a Frenzy Charge when an Enemy Dies while in this Skill's AreaModifiers to Spell Damage apply to this Skill's Damage Over Time effect(0-19)% increased Effect of ChillPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Ice NovaIce NovaSpell, AoE, ColdRadius: 30Mana Cost: (8-23)Cast Time: 0.70 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 120%Requires Level 12A chilling circle of ice expands from the caster. If the caster targets near their Frostbolt projectiles, it will expand from a number of those projectiles instead. If this skill would repeat when cast this way, it will instead expand again from the same projectiles after a short delay.Per 1% Quality:0.5% increased Area of EffectDeals (18-518) to (26-762) Cold DamageCan expand from up to 2 Frostbolt ProjectilesAdds (3-79) to (4-116) Cold Damage against Chilled Enemies20% less Area of Effect when Cast on Frostbolt+(0-4) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Flame SurgeFlame SurgeSpell, AoE, FireRadius: 30Mana Cost: (6-16)Cast Time: 0.50 secCritical Strike Chance: 6.00%Effectiveness of Added Damage: 120%Requires Level 12Strikes enemies in front of you with a surge of flame. Burning enemies are dealt more damage.Per 1% Quality:0.5% increased Cast SpeedDeals (27-563) to (40-844) Fire Damage(50-88)% more Damage with Hits against Burning enemiesCannot Ignite+(0-9) to Area of Effect lengthPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Glacial CascadeGlacial CascadeSpell, AoE, Cold, PhysicalRadius: 12Mana Cost: (12-23)Cast Time: 0.70 secCritical Strike Chance: 5.00%Effectiveness of Added Damage: 60%Requires Level 28Icicles emerge from the ground in a series of small bursts, each damaging enemies caught in the area.Per 1% Quality:1% increased DamageDeals (37-354) to (56-531) Physical Damage60% of Physical Damage Converted to Cold Damage+(0-2) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Magma OrbMagma OrbSpell, AoE, Fire, Projectile, ChainingMana Cost: (6-23)Cast Time: 0.70 secCritical Strike Chance: 5.00%Effectiveness of Added Damage: 140%Lob a fiery orb that explodes as it hits the ground. The skill chains, releasing another fiery orb that repeats this effect.Per 1% Quality:1% increased DamageDeals (9-716) to (12-1073) Fire DamageChains +(1-2) TimesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Support gems which can benefit this setup are:

Multistrike SupportMultistrike SupportAttack, Melee, SupportIcon: 3Mana Multiplier: 160%Requires Level 38Supports melee attack skills, making them repeat twice when used, targeting a random enemy each time. Cannot support Vaal skills, totem skills, channelling skills, or triggered skills.Per 1% Quality:Supported Skills deal 0.5% increased Melee Physical DamageSupported Skills Repeat 2 additional timesSupported Skills have (35-44)% more Melee Attack SpeedFirst Repeat of Supported Skills deals 22% more DamageSecond Repeat of Supported Skills deals 44% more DamageSupported Skills deal (20-10)% less Attack DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Increased Area of Effect SupportIncreased Area of Effect SupportSupport, AoEIcon: EMana Multiplier: 140%Requires Level 38Supports any skill with an area of effect.Per 1% Quality:Supported Skills deal 0.5% increased Area DamageSupported Skills have (30-49)% increased Area of EffectThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Concentrated Effect SupportConcentrated Effect SupportSupport, AoEIcon: oMana Multiplier: 140%Requires Level 18Supports any skill with an area of effect, regardless of whether that skill deals damage.Per 1% Quality:Supported Skills deal 0.5% increased Area DamageSupported Skills have 30% less Area of EffectSupported Skills deal (35-54)% more Area DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Power Charge On Critical SupportPower Charge On Critical SupportSupportIcon: PMana Multiplier: 110%Requires Level 18Supports any skill that hits enemies.Per 1% Quality:Supported Skills have 1% increased Critical Strike ChanceSupported Skills have (35-54)% chance to gain a Power Charge on Critical StrikeSupported Skills deal 4% more Damage per Power ChargeThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Increased Critical Strikes SupportIncreased Critical Strikes SupportSupportIcon: sMana Multiplier: 115%Requires Level 8Supports any skill that hits enemies.Per 1% Quality:Supported Skills have 1% increased Critical Strike ChanceSupported Skills have (50-88)% increased Critical Strike ChanceSupported Skills have +(1-1.9)% to Critical Strike ChanceThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Minion

Another possibility is to use attacks to trigger minions, which benefit from attack supports. In addition to the projectile skills listed before, we have some other good choices:

Double StrikeDouble StrikeAttack, Melee, Strike, PhysicalMana Cost: 5Cast Time: 1.00 secAttack Speed: 80% of BaseEffectiveness of Added Damage: (91%-112%)Performs two fast strikes with a melee weapon.Per 1% Quality:0.5% increased Attack SpeedDeals (91.3-112)% of Base DamageAdds (3-113) to (5-169) Physical Damage against Bleeding Enemies25% chance to cause Bleeding+(0-2) to Melee rangePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Causes two hits per attack, only uses main hand when dual-wielding.

CycloneCycloneAttack, AoE, Movement, Channelling, Physical, MeleeMana Cost: 2Cast Time: 1.00 secAttack Speed: 300% of BaseEffectiveness of Added Damage: (44%-54%)Requires Level 28Channel this skill to move towards a targeted location while spinning, building up stages while constantly attacking enemies in an area around you. While channelling this skill, you cannot be stunned or knocked back.Per 1% Quality:0.5% increased Area of EffectDeals (44-54)% of Base Damage30% less Movement SpeedFirst Hit deals 50% less DamageGains 1 Stage every (0.33-0.17) seconds while Channelling+1 to radius per StageLose 1 Stage every 0.33 seconds while not Channelling(5-28) to (8-42) Added Attack Physical DamageMaximum (3-6) StagesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.: Causes staggered hits rapidly.

Minions generally have poor critical strike capabilities, so critical strike supports are not as effective as they are with projectile spells. Good attack supports include:

Faster Attacks SupportFaster Attacks SupportAttack, SupportIcon: AMana Multiplier: 115%Requires Level 18Supports attack skills.Per 1% Quality:Supported Skills have 0.5% increased Attack SpeedSupported Skills have (25-44)% increased Attack SpeedThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Melee Splash SupportMelee Splash SupportSupport, Melee, Attack, Strike, AoEIcon: SRadius: 14Mana Multiplier: 140%Requires Level 8Supports melee strike skills, causing their melee strike to deal splash damage around each target hit.Per 1% Quality:Supported Skills have 0.5% increased Area of EffectSupported Skills deal (50-41)% less Damage to surrounding targetsSupported Skills deal Splash Damage to surrounding targetsSupported Skills have (0-57)% more Melee Splash Area of EffectThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.: While it does not increase procs much due to the splash happening on a single frame, it greatly improves minion effectiveness.

Multistrike SupportMultistrike SupportAttack, Melee, SupportIcon: 3Mana Multiplier: 160%Requires Level 38Supports melee attack skills, making them repeat twice when used, targeting a random enemy each time. Cannot support Vaal skills, totem skills, channelling skills, or triggered skills.Per 1% Quality:Supported Skills deal 0.5% increased Melee Physical DamageSupported Skills Repeat 2 additional timesSupported Skills have (35-44)% more Melee Attack SpeedFirst Repeat of Supported Skills deals 22% more DamageSecond Repeat of Supported Skills deals 44% more DamageSupported Skills deal (20-10)% less Attack DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.: For Melee attacks.

Additional Accuracy SupportAdditional Accuracy SupportAttack, SupportIcon: aRequires Level 8Supports attack skills.Per 1% Quality:Supported Skills have 1% increased Accuracy RatingSupported Skills have +(74-1034) to Accuracy RatingThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.: Improves minion accuracy greatly, removes the need for accuracy on gear.

Since patch 2.0.0, increasing gem quality on Additional Accuracy SupportAdditional Accuracy SupportAttack, SupportIcon: aRequires Level 8Supports attack skills.Per 1% Quality:Supported Skills have 1% increased Accuracy RatingSupported Skills have +(74-1034) to Accuracy RatingThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. no longer grants 1% increased chance of critical strike per 1% gem quality, and instead gives a simple 1% increased accuracy per 1% gem quality. Accuracy is a desirable stat, as one cannot crit what they cannot actually hit. However, the loss of the critical strike stat granted from gem quality means this is no longer a top-tier supporting gem choice. Losing the critical strike chance affects not only the minion gem in the link; as mentioned minions have poor critical strike capabilities, and were only the minion affected there would be no noticable difference after patch 2.0.0. Of course, this is not the case, as the critical strike chance also affects the attack you are using to proc CoC (the 'trigger' spell), and any other spells to be cast on critical strike (the 'triggered' spells) in the link. This essentially results in less CoC procs overall, less damage from your trigger spell, and less critical hits from your triggered spells as well. This triple-whammy means that Additional Accuracy Support is no longer the top-tier option that it once was, with or without an attached minion and minion-buffing support gems. When considering only the minion, and ignoring any of the triggering/triggered spells & CoC proc rate, the golem/minion is likely perform better with a Faster Attacks Support instead of Additional Accuracy Support; minions will miss more, but making far more attacks per measurement of time. No longer recommended in a CoC link since patch 2.0.0 except to fill in accuracy you desperately need due to poor passive tree and/or gear options.

Most minions are severely capped in number and thus do not benefit much from the high proc rate of Cast On Critical Strike. However, there is one that works well:

Passives and gear

Since "double-dipping" on support gems is key to an effective Cast On Critical Strike setup, having a 5- or 6-link is more important than it is for most builds.

Unlike conventional attack builds, attack damage is not necessary on passives or gear, though it can be helpful in situations where the linked spells are less effective. Attack speed and critical strike chance are the two essential statistics.

Some base item types tend to have better critical hits per second than others:

The spell that is triggered is determined based on the order in which it is socketed, and will cast supported spells in sequence, even across multiple attacks. These items and skills also have cooldowns which limit how often a skill is cast.

These cooldowns apply per-triggered-skill, rather than applying to the trigger gem itself.

Cast on Critical Strike now has a 500ms cooldown, and will now only trigger one spell per frame when you critically strike. It now has 100% chance to trigger casts when you critically strike. It now has 20% more spell damage at level 1, tapered up to 39% at level 20 (1% per level).

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